LDA measurements of steady streaming flows of Newtonian and viscoelastic fluids

LDA experiments have been conducted in a two-dimensional steady streaming flow field in order to determine the secondary velocity profiles. We describe here an LDA system developed to resolve small secondary-flow velocities and to detect flow reversals due to viscoelasticity. Results compare well wi...

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Bibliographic Details
Published in:Experiments in fluids 1995-11, Vol.20 (1), p.21-28
Main Authors: VLASSOPOULOS, D, SCHOWALTER, W. R
Format: Article
Language:English
Subjects:
Error analysis
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Laser Doppler velocimeters
Measurement errors
Newtonian flow
Newtonian liquids
Non Newtonian liquids
Non-newtonian fluid flows
Physics
Pipe flow
Velocity measurement
Viscoelasticity
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Summary:LDA experiments have been conducted in a two-dimensional steady streaming flow field in order to determine the secondary velocity profiles. We describe here an LDA system developed to resolve small secondary-flow velocities and to detect flow reversals due to viscoelasticity. Results compare well with theoretical predictions. A detailed analysis of the errors and uncertainties involved in the measurements confirms the reliability and reproducibility of the measurements. Although the method has been applied here to a specific flow field, the technique should be applicable to a number of secondary flows, such as those which can occur in curved pipes and in oscillating pipe flows. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/BF00190594